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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical behaviour of an advanced powder metallurgy nickel base superalloy processed through hot isostatic pressing route for aerospace applications
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Microstructure and mechanical behaviour of an advanced powder metallurgy nickel base superalloy processed through hot isostatic pressing route for aerospace applications

机译：通过热等静压途径进行航空航天应用的先进粉末冶金镍基超合金的微观结构和力学行为

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摘要

An advanced powder metallurgy (P/M) nickel-base superalloy envisaged for aerospace applications is realized through hot isostatic pressing (HIPing) of inert gas atomized powder. Extensive characterization of the micro-structural features at different scales by employing optical microscopy, SEM-EBSD and transmission electron microscopy (TEM) divulged multi-modal distribution of y' precipitates within austenitic γ-FCC matrix phase in the as-HIPed condition. Investigation of prior particle boundary precipitates (PPBs) through TEM and Electron Probe Micro Analysis (EPMA) techniques revealed the dominance of metallic oxides and MC type carbides. The suitability of the advanced P/M superalloy for realizing near-net shape components by Direct-HIPing for short duration aeroengine rotating components is assessed by evaluating the room temperature and elevated temperature tensile behaviour as well as stress-rupture life in the service temperature regimes. The yield strength and the ultimate tensile strength of the present alloy at 650 °C are found to be 850 MPa and 1275 MPa respectively combined with 28% of ductility which is comparable to those of the similar class of superalloys in service. On the other hand, the as-HIPed superalloy exhibited minimum 1000 h of stress rupture life around service temperatures and bettered the stress rupture life of wrought superalloy IN718 alloy showing its potential for fabrication of near-net shape components for aerospace applications.
机译：通过惰性气体雾化粉末的热等静压（臀部）来实现设想用于航空航天应用的先进粉末冶金（P / M）镍基超合金。通过采用光学显微镜，SEM-EBSD和透射电子显微镜（TEM）沉淀在奥氏体γ-FCC基矩阵中的微观显微镜，SEM-EBSD和透射电子显微镜（TEM）泄露的多模态分布在奥氏体γ-FCC基矩阵中的微结构特征在不同尺度下进行广泛表征。通过TEM和电子探针微分析（EPMA）技术对先前粒子边界沉淀（PPBS）的研究显示了金属氧化物和MC型碳化物的优势。通过评估室温和高温拉伸行为以及服务温度制度的应力破裂的寿命来评估通过直接伴随持续时间用于短持续时间的近腹膜旋转部件来实现近净形状部件的适用性。 。屈服强度和本合金的最终拉伸强度在650℃下发现为850MPa和1275MPa，分别与28％的延展性组合，其与类似类别的超合金的延展性相当。另一方面，AS-Hiped SuperAlloy在服务温度周围发挥了至少1000小时的应力破裂寿命，并更好地改善了锻造超合金的应力破裂寿命，显示其用于航空航天应用的近净形型部件的潜力。

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